Another Time, Another Place. Season 1, Episode 16. First broadcast Thursday 18 December 1975.

This month, an unexpected scripting anomaly returns the Moon to Earth’s orbit, where it will inevitably crash into another slightly older Moon, killing everyone on the base. But in the meantime, we experience a strange and elegiac meditation on having nowhere to belong and on our subjection to the vagaries of time. Haunting and inexplicable.

The Full Circle. Season 1, Episode 15. First broadcast Thursday 11 December 1975.

This month, a picnic on a verdant new planet — fresh air, space buggies, aggressive and bloodthirsty lice, hitting people with rocks, and menacing people with burning knives. But, for once, no one wants to kill everyone on the base, except the audience, probably.

Earthbound. Season 1, Episode 14. First broadcast Thursday 4 December 1975.

This month, to our surprise, Christopher Lee turns up on Alpha, not to kill everyone on the base for once, but just to be terribly nice to everyone. But Alpha harbours a villain of its own, one even deadlier than Christopher Lee, but mostly to himself.

Matter of Life and Death. Season 1, Episode 13. First broadcast Thursday 27 November 1975.

In this month’s long-delayed first regular episode, Barbara’s zombie husband returns from the dead to warn Koenig about Alpha’s planned Operation Exodus — a plan which will (inevitably) kill everyone on the base. But does he listen?

End of Eternity. Season 1, Episode 12. First broadcast Thursday 20 November 1975.

This month, Peter Bowles drops Jonty and Charlotte off at school before heading over to Pinewood Studios to spend the day throwing security guards at each other and threatening to torture and kill everyone on the base. While wearing a surprisingly lovely outfit.

Guardian of Piri. Season 1, Episode 11. First broadcast Thursday 13 November 1975.

Just six weeks ago, famous miserable bastard John Koening was saving the entire crew from the horrific prospect of eternal bliss in the company of the hottest models the 1970s could offer. This week, he’s doing the same thing, only this time he’s brought a gun.

Black Sun. Season 1, Episode 10. First broadcast Thursday 6 November 1975.

This month’s eerie and irrational space anomaly is, of course, intent on killing everyone on the base, and so with no hope left, the crew have no choice but to discover love, tranquility and grace. And to learn the valuable lesson that certain death is never certain when everyone is still contracted to do another twenty episodes.

Mission of the Darians. Season 1, Episode 9. First broadcast Thursday 30 October 1975.

This month, we’ve been invited to a century-long dinner by Joan Collins. The menu, as always: the basic proteins, amino acids, trace elements and enzyme variants of the lower classes.

Dragon’s Domain. Season 1, Episode 8. First broadcast Thursday 23 October 1975.

This month’s eldritch alien threat is, for once, not intent on killing everyone on the base; instead it takes the more focused approach of killing everyone on a deep space probe and then hunting down and destroying Moonbase Alpha’s resident Italian big game hunter. Oh, and traumatising an entire generation of nerdy moppets in the 1970s.

Alpha Child. Season 1, Episode 7. First broadcast Thursday 16 October 1975.

An eerie green glow is making for Alpha, bringing with it the most terrible consequences, as the first baby born on the base undergoes two periods of ultra-rapid growth, becoming in mere seconds a terrifying English moppet and shortly after that Julian Glover in a skimpy miniskirt. Is this the next stage in human evolution, or merely an invasion by an alien who wants to give his mother a nice makeover and a good rogering before (inevitably) killing everyone on the base?